基于二维动态水质模型的长江蕲春段水污染扩散分析  

Analysis of water pollution dispersion at Qichun section of the Yangtze River based on the 2-D dynamic water quality model

作　　者：袁玥[1,2] 师懿[1] 程胜高 

机构地区：[1]中国地质大学(武汉)环境学院,武汉430074 [2]武汉市环境保护科学研究院,武汉430015

出　　处：《安全与环境学报》2016年第1期212-217,共6页Journal of Safety and Environment

基　　金：湖北省省级环保科研项目(2012HB03)

摘　　要：为定量预测非正常排污事故对水环境的影响,应用Mike21FM二维水质模型软件对长江蕲春段沿江排污口正常和非正常排污情况下的污染物迁移扩散情况进行了数值模拟,预测了事故中污染物在时间和空间上的变化规律。结果表明,在非正常排污事故发生后,排污口下游约68 km2的水域面积会受到影响,对该区域水环境影响较大。预测结果量化了污染事故在各时段的影响范围及影响强度,并明确了事故发生时的重点保护对象为排污口下游10.4 km处的蕲州镇饮用水水源地。In order to predict the serious negative impacts of the ab- normal sewage accidents and define the predictable target protection areas, this paper aims at stimulating the impacts of the surrounding water environment, in case any abnormal waste drainage is in need to be discharged. Such sorts of drainage discharges may be caused by any accidents, such as the equipment or installations failure, the sudden strong rainstorms or power failure. Coming from the aforemen- tioned research needs, we have chosen a sewage outlet at the Qichun section of the Yangtze River. To accomplish our research, we have adopted the hypothesis and analogs concerned based on the Mike21 FM, a 2-D hydrodynamic and water quality evaluation model. The model Mike21 FM we would like to choose has been endowed with two major functions： One is to simulate the migration and diffusion of the pollutants coming along with the normal waste drainage, whereas the other is to forecast the variation trend of the accidental pollutants in time and space. The results of our simulated research indicate that, different with the normal waste drainage situation, the emissions of COD and NH3 - N tend to have more serious impacts on the regular river water current environment in the normal waste drainage condi- tions. The likely-to-be affected areas as a result of our assessment have been worked out at about 68 square kilometers to the down- stream areas. What is more, the water environment of the downstream villages is likely to be exposed to the risk and threat in a period of time of 20 hours when the experiment is over. Besides, it can be concluded that special attention has to be paid to the targeted protec- tion object--the drinking water source of the section under study, which is 10.4 kilometers away from the drainage outlet, whenever the potential risk is involved. With this simulated prediction method, it can be believed that the seriousness and scope of the predicted im- pacts of pollution accidents on the downstream area can be expressed quantitatively

关 键 词：环境工程学 二维水质模型 水污染事故 长江蕲春段 

分 类 号：X522[环境科学与工程—环境工程]